ShockNCT07644494
Distensibility Index of Inferior Vena Cava in Assessing Fluid Responsiveness: The Impact of Spontaneous Respiratory Effort
An observational study of Shock, run by Jingyuan,Xu at 1 site in China.
Trial summary
This study explored how inspiratory effort affects the accuracy of the distensibility index of inferior vena cava (dIVC) in assessing fluid responsiveness (FR).This prospective observational study was conducted in an intensive care unit of a university hospital and included shock patients receiving ventilation with… Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Shock
- What is being tested?
- explored how inspiratory effort affects the accuracy of the distensibility index of inferior vena cava in assessing fluid responsiveness
- Type of treatment
- Lifestyle or therapy programme
- How many people
- 50 participants
- Where
- 1 siteChina
- Study dates
- 1 Jun 2024to 31 May 2025
- Phase
- Observational
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: This prospective observational study was conducted in an intensive care unit of a university hospital and included shock patients receiving ventilation with spontaneous breathing activity
Who may be able to join
- defined as shock who has the presence of systolic blood pressure (SBP) ≤ 90 or a > 40 mmHg decline of SBP in patients known to be hypertensive or mean arterial pressure (MAP) ≤ 70 mmHg or requiring vasopressors to maintain SBP > 90 mmHg or MAP > 70 mmHg, along with signs of hypoperfusion (urinary flow < 0.5 ml/kg/min for > 2 h, or presence of skin mottling or blood lactate concentration ≥ 2.0 mmol/L);
- received mechanical ventilation;
- had the Pulse Indicator Continuous Cardiac Output (PiCCO) catheter for hemodynamic monitoring；
- had the sign of fluid administration which include: (a) MAP < 65 mmHg and/or SBP < 90 mmHg; (b) the need for vasopressors; (c) urinary flow < 0.5 ml/kg/min for >2 h; (d) tachycardia; (e) lactic acidosis; or (f) delayed capillary refilling.
Who cannot join
- were pregnant;
- were younger than 18 years of age;
- could not have spontaneous respiratory drive or effort measured;
- had intra-abdominal pressure ≥ 16 cmH₂O [15];
- had conditions affecting dIVC measurement, such as ECMO cannulation;
- had factors precluding clear ultrasound imaging;
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- defined as right ventricular dysfunction who has (a) tricuspid annular plane systolic excursion < 16 mm; (b) moderate or greater tricuspid regurgitation; (c) moderate or greater pulmonary artery hypertension[16];
- expected to die within 24 hours;
- had family members of the patient declined enrollment.
Trial locations and contacts
1 site in 1 country.
About this study
This study explored how inspiratory effort affects the accuracy of the distensibility index of inferior vena cava (dIVC) in assessing fluid responsiveness (FR).This prospective observational study was conducted in an intensive care unit of a university hospital and included shock patients receiving ventilation with spontaneous breathing activity. Hemodynamic parameters were collected before and after fluid challenge by the pulse indicator continuous cardiac output. dIVC was calculated by ultrasound, and respiratory effort was assessed using airway occlusion pressure (P0.1) and end-expiratory occlusion pressure (Pocc) before fluid administration. Responders were defined by a ≥10% increase in cardiac output (CO) after 250 mL saline infused in 10 minutes. The dIVC > 18% was considered indicative of FR. Predictive performance was evaluated using area under receiver operating characteristic curves (AUROC), stratified by P0.1 and Pocc.
- Conditions
- Shock
- Being tested
- explored how inspiratory effort affects the accuracy of the distensibility index of inferior vena cava in assessing fluid responsiveness
- Keywords
- Shock, Fluid Responsiveness, Inferior Vena Cava, Spontaneous Breathing Effort, Ultrasound
- Medical subject headings
- Shock
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
explored how inspiratory effort affects the accuracy of the distensibility index of inferior vena cava in assessing fluid responsivenessBehavioural
What is being measured
The primary outcome is the main question the study is designed to answer.
inspiratory effort affects the accuracy of the distensibility index of inferior vena cava in assessing fluid responsiveness
Measured: immediate
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted12 Jun 2026
- Study start1 Jun 2024
- Primary completion31 Mar 2025
- Study completion31 May 2025
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for ShockStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Cohort
- Time perspective
- Prospective
- Enrolment
- 50 participants (actual)
Sponsor and investigators
- Lead sponsor
- Jingyuan,Xu
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor-investigator, Jingyuan,Xu, Southeast University, China
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07644494
- Sponsor's protocol ID
- 2022ZDSYLL328-P01
- Status last verified
- Jun 2026
- First submitted
- 8 Jun 2026
- Last updated
- 12 Jun 2026
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 12 Jun 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Distensibility Index of Inferior Vena Cava in Assessing Fluid Responsiveness: The Impact of Spontaneous Respiratory Effort
- ClinicalTrials.gov ID
- NCT07644494
- Acronym / sponsor ID
- 2022ZDSYLL328-P01
- Conditions
- Shock
- Keywords
- Shock, Fluid Responsiveness, Inferior Vena Cava, Spontaneous Breathing Effort, Ultrasound
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 50 participants (actual)
- Lead sponsor
- Jingyuan,XuUniversity, hospital or other
- Study start
- 1 Jun 2024 (actual)
- Primary completion
- 31 Mar 2025 (actual)
- Study completion
- 31 May 2025 (actual)
- First posted
- 12 Jun 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This study explored how inspiratory effort affects the accuracy of the distensibility index of inferior vena cava (dIVC) in assessing fluid responsiveness (FR).This prospective observational study was conducted in an intensive care unit of a university hospital and included shock patients receiving ventilation with spontaneous breathing activity. Hemodynamic parameters were collected before and after fluid challenge by the pulse indicator continuous cardiac output. dIVC was calculated by ultrasound, and respiratory effort was assessed using airway occlusion pressure (P0.1) and end-expiratory occlusion pressure (Pocc) before fluid administration. Responders were defined by a ≥10% increase in cardiac output (CO) after 250 mL saline infused in 10 minutes. The dIVC > 18% was considered indicative of FR. Predictive performance was evaluated using area under receiver operating characteristic curves (AUROC), stratified by P0.1 and Pocc.
Study design
- Observational model
- Cohort
- Time perspective
- Prospective
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- This prospective observational study was conducted in an intensive care unit of a university hospital and included shock patients receiving ventilation with spontaneous breathing activity
Key inclusion criteria (4 listed)
- defined as shock who has the presence of systolic blood pressure (SBP) ≤ 90 or a > 40 mmHg decline of SBP in patients known to be hypertensive or mean arterial pressure (MAP) ≤ 70 mmHg or requiring vasopressors to maintain SBP > 90 mmHg or MAP > 70 mmHg, along with signs of hypoperfusion (urinary flow < 0.5 ml/kg/min for > 2 h, or presence of skin mottling or blood lactate concentration ≥ 2.0 mmol/L);
- received mechanical ventilation;
- had the Pulse Indicator Continuous Cardiac Output (PiCCO) catheter for hemodynamic monitoring；
- had the sign of fluid administration which include: (a) MAP < 65 mmHg and/or SBP < 90 mmHg; (b) the need for vasopressors; (c) urinary flow < 0.5 ml/kg/min for >2 h; (d) tachycardia; (e) lactic acidosis; or (f) delayed capillary refilling.
Key exclusion criteria (9 listed)
- were pregnant;
- were younger than 18 years of age;
- could not have spontaneous respiratory drive or effort measured;
- had intra-abdominal pressure ≥ 16 cmH₂O [15];
- had conditions affecting dIVC measurement, such as ECMO cannulation;
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| explored how inspiratory effort affects the accuracy of the distensibility index of inferior vena cava in assessing fluid responsiveness | Behavioural | – |
Primary outcome
inspiratory effort affects the accuracy of the distensibility index of inferior vena cava in assessing fluid responsiveness
Time frame: immediate
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 12 Jun 2026.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Shock, run by Jingyuan,Xu at 1 site in China.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 9 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 12 Jun 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in China. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
inspiratory effort affects the accuracy of the distensibility index of inferior vena cava in assessing fluid responsiveness (time frame: immediate). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 12 Jun 2026; AzTrials last refreshed its copy on 8 Nov 2026.